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LDAP stops responding

By bharringtonwsc ·
I have four Windows 2003 Enterprise domain controllers that stop responding to ldap requests for about 20 minutes. This happened about a month ago and again last week. I didn't have ldap searches per sec logging so I don't know if it was some sort of DoS attack or a misconfiguration somewhere. I have 2 of the 4 servers recording ldap requests now and the other 2 will be recording after this weekend.(the perfmon counters need to be reloaded on those two because when UMOVE made them DC's it didn't load the counters). The average load is perhaps 200 ldap searches per second for the two servers I can monitor, the other two will have much higher requests because our greylisting and SPF server authenticate to them. I'm not seeing anything in Event Viwer that is too indicative even with the LDAP events reg key set to 3. I've run DCdiag /v, netdiag and repadmin. The DCdiag failed the event viewer because of a KCC event "An LDAP CLient Connection was closed because of an error" Anyone have any ideas?

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